ux v1.37.1: open-wall tool hover — default cursor, pointer + stretch preview near walls

- _openWallHit shared by click and hover; amber dashed preview of the
  stretch that would open, red solid when the click would close it;
  stage.wallhot drives the pointer cursor
- smoke_openwall_hover.mjs (9 checks); TESTING/CHANGELOG same-commit

demo/smoke_openwall_hover.mjs

@@ -0,0 +1,36 @@
+import { launch } from './serve.mjs';
+const { page, browser } = await launch();
+const res = await page.evaluate(async () => {
+  const out = {};
+  const c = window.__card;
+  const sr = () => c.shadowRoot || c.renderRoot;
+  const stage = () => sr().querySelector('.stage');
+  c._setMode('plan'); c._tool = 'openwall'; await c.updateComplete;
+  const H = 1000 / (c._curSpaceCfg.aspect || 1);
+  // 1) без наведения: курсор default, превью нет
+  c._cursorPt = null; c.requestUpdate(); await c.updateComplete;
+  out.idleCursor = getComputedStyle(stage()).cursor === 'default';
+  out.noPreview = !sr().querySelector('.openwall-preview');
+  // 2) наведение на общую стену r1|r2 (x=550): pointer + янтарное превью
+  c._cursorPt = [550, 0.25 * H]; c.requestUpdate(); await c.updateComplete;
+  out.hotCursor = getComputedStyle(stage()).cursor === 'pointer';
+  const prev = sr().querySelectorAll('.openwall-preview');
+  out.previewShown = prev.length > 0;
+  out.previewAmber = prev.length ? !prev[0].classList.contains('willclose') : null;
+  // превью лежит на стене x=550
+  out.previewOnWall = prev.length ? Math.abs(Number(prev[0].getAttribute('x1')) - 550) < 0.5 : null;
+  // 3) наведение в центр комнаты: снова default, превью исчезло
+  c._cursorPt = [300, 150]; c.requestUpdate(); await c.updateComplete;
+  out.missCursor = getComputedStyle(stage()).cursor === 'default';
+  out.missNoPreview = !sr().querySelector('.openwall-preview');
+  // 4) открыть границу → навести снова: превью красное сплошное (клик закроет)
+  c._openWallClick([550, 0.25 * H]); await c.updateComplete;
+  c._cursorPt = [550, 0.25 * H]; c.requestUpdate(); await c.updateComplete;
+  const prev2 = sr().querySelector('.openwall-preview');
+  out.willclose = prev2?.classList.contains('willclose') === true;
+  // прибрать
+  c._openWallClick([550, 0.25 * H]); await c.updateComplete;
+  return out;
+});
+console.log(JSON.stringify(res, null, 1));
+await browser.close();